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  • 1 University of West Bohemia Faculty of Applied Sciences Husova 11 306 14 Pilsen Czech Republic
  • 2 Prague Institute of Chemical Technology Technická 5 166 28 Prague Czech Republic
  • 3 Nuclear Research Institute 250 68 Řež Czech Republic
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Extraction of microamounts of cesium by nitrobenzene solutions of potassium dicarbollylcobaltate (K+B) and rubidium dicarbollylcobaltate (Rb+B) in the presence of benzo-15-crown-5 (B15C5, L) has been investigated. The equilibrium data have been explained assuming that the complexes ML+ and ML2+ (M+ = K+, Rb+, Cs+) are present in the organic phase. The stability constants of the species ML+ and ML2+ (M+ = K+, Rb+) in nitrobenzene saturated with water have been determined.